On the female side, problems with anovulation (a
lack of ovulation), blocked fallopian tubes, or inability
of an embryo to implant and establish a pregnancy in the uterus can all
result in infertility.
Lack of ovulation, whether it occurs naturally as the
result of aging ovaries, or unnaturally, from extremes
of stress, exercise, diet, and / or use
of synthetic hormones in HRT or birth control pills, will cause estrogen to drop from 40 to 60 percent (enough to stop the menstrual cycle), but progesterone levels plummet much lower, to nearly zero in some women causing a raft
of symptoms from heavy / painful periods, mood swings, PMS and depression to water retention, weight gain, slowed thyroid function, and heightened risks for endometriosis, fibroids, fibrocystic breasts as well as breast and uterine cancer.